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The differential grasshopper (Melanoplus differentialis) is a species of grasshopper belonging to the genus Melanoplus found throughout northern Mexico, central United States and southern Ontario, Canada. It is considered a pest in most of its range.he differential grasshopper (Melanoplus differentialis) is a species of grasshopper belonging to the genus Melanoplus found throughout northern Mexico, central United States and southern Ontario, Canada. It is considered a pest in most of its range.
The grasshopper nematode (Mermis nigrescens) is a long slender worm that infests grasshoppers, living in the insect's hemocoel. Adult worms lay eggs on plants and the host gets infected when it eats the foliage.he eggs are the subject of attack by parasitoids and predators. Grasshoppers have had a long relationship with humans. Swarms of locusts have had dramatic effects that have changed the course of history, and even in smaller numbers grasshoppers can be serious pests.